AQA GCSE Biology

Revision Notes

4.1.5 Uses of Glucose from Photosynthesis

Uses of Glucose

  • The glucose produced in photosynthesis may be:
    • Used for respiration (both aerobic and anaerobic)
    • Converted into insoluble starch for storage in the stems, leaves and roots
    • Used to produce fat or oil for storage (especially in seeds)
    • Used to produce cellulose, which strengthens the cell wall
    • Combined with nitrate ions absorbed from the soil to produce amino acids for protein synthesis

The fate of glucose, IGCSE & GCSE Biology revision notes

The fate of glucose

  • A test to show that a plant is photosynthesising is to test the leaf for the presence of starch using iodine
  • This can be used to show the effect of light on photosynthesis

 

Testing a variegated leaf for starch, IGCSE & GCSE Biology revision notes

Starch testing of leaves shows that photosynthesis has been taking place

Exam Tip

Remember that plants always respire to release energy – but they only photosynthesise during the day if conditions are right.

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Jenna studied at Cardiff University before training to become a science teacher at the University of Bath specialising in Biology (although she loves teaching all three sciences at GCSE level!). Teaching is her passion, and with 10 years experience teaching across a wide range of specifications – from GCSE and A Level Biology in the UK to IGCSE and IB Biology internationally – she knows what is required to pass those Biology exams.
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